FAUNA OF THE CHESS AND QADE. 



343 



large variety of C. viridis."' Again, M. Jules Richard considers 

 €. gigas to be merely a variety presenting no specific difference 

 from the normal type. 



The numerous specimens of Cyclops, having the specific 

 features of C. viridis, obtained during the last four years in the 

 country of the Chess and Gade will be described in the manner 

 stated by Brady and Richard, the smaller forms being considered 

 to be C. viridis, and the large ones to be a variety gigas. 



Fig. 31. 



Fig. 31 represents a specimen of C. viridis of the normal 

 iype in dorsal view. The anterior antennas are 17-jointed 

 and nearly as long as the first cephalothoracic segment. In 

 outline the cephalothorax approximates to an ellipse ; in fact, an 

 ellipse drawn with its major axis a little longer than twice its 

 minor axis serves as an excellent guide in drawing the cephalo- 

 thorax. The furcal segments are comparatively long, and each 

 has a conspicuous lateral spine. All four tail-setae are richly 

 ciliated ; the third is the longest, and the first or outermost the 



